Avengers: Endgame - 33 Easter Eggs & References Explained

By Jack Pooley / April 26, 2019

18. "I Can Do This All Day"

When 2023 Cap ends up facing off against his 2012 self, past Cap proudly tells him, "I can do this all day", serving as a call-back to the one-liner Cap deployed in two prior movies.

He first used the line in Captain America: The First Avenger when cornered in an alley-way in the 1940s, and once again during his climactic battle against Iron Man in Captain America: Civil War.

This time, of course, Cap has to endure the phrase himself, and hilariously quips back to past Cap, "Yeah, I know."